scsi: ufs: core: Honor runtime/system PM levels if set by host controller drivers

Otherwise, the default levels will override the levels set by the host
controller drivers.

Signed-off-by: Manivannan Sadhasivam <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Bart Van Assche <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/ufs/core/ufshcd.c

···
 	}
 
 	/*
-	 * Set the default power management level for runtime and system PM.
+	 * Set the default power management level for runtime and system PM if
+	 * not set by the host controller drivers.
 	 * Default power saving mode is to keep UFS link in Hibern8 state
 	 * and UFS device in sleep state.
 	 */
-	hba->rpm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
+	if (!hba->rpm_lvl)
+		hba->rpm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
 						UFS_SLEEP_PWR_MODE,
 						UIC_LINK_HIBERN8_STATE);
-	hba->spm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
+	if (!hba->spm_lvl)
+		hba->spm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
 						UFS_SLEEP_PWR_MODE,
 						UIC_LINK_HIBERN8_STATE);